import java.math.BigInteger;
import java.util.Arrays;
import java.util.Scanner;

/**
 * @author : niu niu
 * @version : 1.0.0
 * @date : 2023/4/6 9:19
 * 不用加减乘除做加法 -异或的用法
 *  三角形 -大数据如何处理 使用BigInteger
 */
public class Day27 {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        while (s.hasNext()){
            BigInteger[] integers = new BigInteger[3];
            for (int i = 0; i < 3; i++) {
                integers[i] = s.nextBigInteger();
            }
            Arrays.sort(integers);
            if (integers[0].add(integers[1]).compareTo(integers[2]) > 0){
                System.out.println("Yes");
            }else{
                System.out.println("No");
            }

        }
    }
    //-------------------------------------异或的用法
    public int Add(int num1,int num2) {
        while (num2 != 0){
            int tem = num1 ^ num2;
            num2 = (num1 & num2) << 1;
            num1 = tem;
        }
        return num1;
    }
}
